To get access token to be used in WhatsApp integration:
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Receiving the auth_code on the redirect URI
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Validate this auth_code using the Validate Auth Code and Client API.
You will receive an accesss_token.
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Use the accesss_token in the following integrations:
Note:
Refresh Token API for WhatsApp Integration is used to fetch new access_token using the refresh_token received in the Validate Auth Code and Client API.